Malicious PDF — malware analysis report

Static analysis result for SHA-256 21cc7fa6b191a28b…

MALICIOUS

PDF

64.0 KB Created: 2021-08-20 15:59:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 48692fc2984e6c91139e3efb45c33082 SHA-1: ec3abad733d33f50c328fe15e03704c303cc15f4 SHA-256: 21cc7fa6b191a28b6098719138a2e64a9d04747e0078f0cd2a27657296c51199
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of external URIs and a high risk score indicate a strong likelihood of phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9586

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f2b6a8218---18782933748.pdf In PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8b4db87f8---61522167559.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/75966542137.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/masezonexafof.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/1ca77ea3057da1f785f1e4a4808ae0ac/66058752120.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/3a55a9dae570fd29a0d65cfbc8afb29c/xomunap.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/8tf2ie6k61lhgom2q6f53fopr6/petobefupa.pdfIn PDF document text
    • http://ssujaxchapter.com/clients/83257/File/mamewewumevafes.pdfIn PDF document text
    • http://zonwering-belgie.be/ckfinder/userfiles/files/momavimurabupukixejib.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/t2c1rllfahgb8l1g8fdba2a1d4/76781045667.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/36855575799.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/36864481516.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/tsjjlkis8pfq0q17rdt60cc4s8/16709238536.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/72872732190.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dca947b1c7c---pupevabazumeku.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/mameduguloz.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/11610333870.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/21486889036.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/egfdg6mvb4mgidlso9dg46f24l/welomanox.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/18457241639.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/75251952317.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=catalogue+of+admiralty+charts+and+publications+%28np131%29PDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC947 11832 bytes
SHA-256: e455c67d08507b1e2206db9552b1bdc186fa84b27709929d4ee212c352fc6bee

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